people who are unprepared

Everyone approaches a danger with more courage if he has prepared in advance how to confront it. Anyone can endure difficulties better if he has previously practiced how to deal with them. People who are unprepared can be unhinged by even the smallest of things.

Seneca

The naive mind imagines effortless success. The cowardly mind imagines hardship and freezes. The resilient mind imagines hardship and prepares.

Resilience: Hard-won Wisdom for Living a Better Life by Eric Greitens. Houghton Mifflin Harcourt. 2015. p.181